JOURNAL OF THE NEW JERSEY 



M. Shell of but a single whorl ; aperture more than 'i the area of tht- 



shell; minute, less than 2 long 41. Philinidcp. 



M. Shell of several whorls, under 4 long; spire flat 39. Scaphandrid(P . 



M. vShell of several whorls; a pit in place of the spire; over 6 long 



40. Bullidw: 



N. Anterior margin of aperture entire, usually rounded. (S.) 

 N. Anterior margin of apesrture notched or produced into a canal. (O.) 

 O. Shell with a canal formed by a decided prolongation of the anterior 



end. (V.) 

 O. Canal short or none, but the aperture notched. (P.) 



P. Shell large, 40 or more long ; whorls rounded 52. Buccinidce. 



P. Shells 20-40 long ; whorls rounded 55. Muricidce. 



P. Whorls flattened and in most species covered with a beaded surface formed 

 by longitudinal and revolving lines or else revolving lines very distinct.. 



(Q.) 

 Q. Aperture over | the length of the shell ; angle of spire over 40°. Shell 



10-30 long 53. Nassidcc. 



Q. Aperture i or less the length of the shell. (R.) 



R. Rather long shells (15-70), angle of spire under 20°. ...49. Terebrida\ 

 R. Shells less than 15 long; aperture about I the length, Avhor's 9 or 



more • 59. Cerithiopsidw. 



R. Shells less than 10 long ; aperture about ] the length ; whorls under 9. 



60. Cerithiid(e. 



S. Shell tubular, spiral at the apex, irregularly twisted near the aperture. 



62. Vermetidce. 



S. Shell regularly spiral ; elongated, width less than h the length ; whorls 

 5 or more ; angle of spire less than 45° ; aperture less than half the length 

 of the shell. (T.) 

 S. Shell regularly spiral; shortened; width nearly as great as or greater 

 than the length; whorls usually few ; angle of spire always over 50° 

 usually over 90° ; aperture over h the length of the shell. (U.) 

 T. Whorls rounded, almost separated, croased by elevatqd longitudinal 



ribs; aperture oval ; lip continuofs; our species over 10 long 



56. Scalaridce. 



T. Whorls about 5 ; minute shells, less than 5 long; width about ^ length ; 



aperture about .^ leiiglh ; apex blunt 64. Rissoidcp. 



T. Whorls 5-10; shells elongated-conical, turreted ; aperture }-i; our 



species 4-10 long 57. Pyramidellidw. 



U. Shell conical ; pearly under the ejiidermis and within the aperture. 



